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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2005-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.actors
package scheduler
import scala.concurrent.ManagedBlocker
/**
* @author Erik Engbrecht
*/
private[actors] trait DelegatingScheduler extends IScheduler {
protected def makeNewScheduler(): IScheduler
protected var sched: IScheduler = null
final def impl = synchronized {
if ((sched eq null) || (!sched.isActive))
sched = makeNewScheduler()
sched
}
final def impl_= (scheduler: IScheduler): Unit = synchronized {
//TODO: if there is already a scheduler, should it be shutdown?
sched = scheduler
}
/**
* Always active because it will just make a new scheduler if required
*/
def isActive: Boolean = true
def execute(fun: => Unit) = impl.execute(fun)
def execute(task: Runnable) = impl.execute(task)
override def executeFromActor(task: Runnable) = impl.executeFromActor(task)
def shutdown(): Unit = synchronized {
if (sched ne null) {
sched.shutdown()
sched = null
}
}
def newActor(actor: TrackedReactor) = synchronized {
val createNew = if (sched eq null)
true
else sched.synchronized {
if (!sched.isActive)
true
else {
sched.newActor(actor)
false
}
}
if (createNew) {
sched = makeNewScheduler()
sched.newActor(actor)
}
}
def terminated(actor: TrackedReactor) = impl.terminated(actor)
def onTerminate(actor: TrackedReactor)(f: => Unit) = impl.onTerminate(actor)(f)
override def managedBlock(blocker: ManagedBlocker): Unit =
impl.managedBlock(blocker)
}
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